Description: This kit is complete electronics package to build small CNC router, engraver, mill or robot. Support for up to 4 axis with included stepper drivers. Kit includes CNC V3 Arduino shield, Arduino UNO R3 Compatible board and DRV8825 Stepper Drivers. UNO R3 Board has miniature micro-USB connector for connection with the computer. Size: Approx. 6.8x5.2cm/2.68x2.05inch 2x1.5cm/0.79x0.59inch 6.8x 5.3cm/2.68x2.09inch Specification: CNC V3 Shield features: Can drive four axes: four receptacles for A4988, DRV8825 or other StepStick compatible drivers. Easy to reach Reset push button. Headers for XYZA steppers, XYZA end stops, spindle control, ESTOP. Screw terminal block for power input. Compatible with GRBL firmware. ATmega328P Arduino UNO R3 features: older style DIP ATmega328P chip changed to flat package chip. This board uses CH340 USB-to-serial interface chip, instead of 16U2 (USB drives installed automatically under Windows 7/8). Added 3 rows of holes for wiring. Added 2 rows of holes for dupont style headers (headers are useful if you connect cables directly to Arduino board). USB connector receptacle changed to Micro-USB connector receptacle. CH340G Driver installation under Windows 7/8: Connect UNO R3 Board with computer running Windows 7/8 via Micro-USB cable. Wait until Windows will automatically install CH340 driver. Windows will assign and show COM Port number to CH340 interface, note this COM port number and use it to connect with UNO R3 board. Package Includes: 1 piece of CNC V3 Shield 1 piece of UNO R3 Arduino compatible board 4 piece of DRV8825 Stepper Drivers with heatsinks
